Main BEARING SET P-Series Tri Metal bearings are the oldest members of the Clevite 77 performance-bearing family.
They're intended for high-revving engines, especially those where the high rpm cause the rod bores to narrow.
To compensate for this distortion, they have higher eccentricity and a high crush factor.

Choose bearing size below.
Standard is for a new or unturned crankshaft.
.25mm/.50mm sizes are for crankshafts that have been turned.
Your machine shop will tell you what size you need if they turned the crank.